William m



(NoModeL) W M MAoKAY WATER HEATING ATTACHMENT FOR HOT AIR FURNACES.

No. 371,269. Patented Oct. 11,1887.

IIIIIII u. PETERS. HMO-Lilhorlphn Wallin lan. n. a

' UNITED STATES PATENT OFFICE.

WVILLIAM M. MAOK AY, OF NEWARK, NEW JERSEY, AS SIGNOR TO THE DENNY BROTHERS COMPANY, OF SAME PLACE.

WATER-HEATING ATTACHMENT FOR HOT-AIR FURNACES. V

SPECIFICATION forming par; of Letters Patent No. 371,269, dated October 11, 1887.

Application filed January 3|, 1887. Serial No. 225,983. (No model.)

To all whom it may concern.-

Be it known that 1, WILLIAM M. MAGKAY,

a subject of the Queen of Great Britain, residing at Newark, Essex county, New Jersey, have invented certain new and useful Improvements in \Vater-Heating Attachments for Hot-Air Furnaces, fully described and represented in the following specification and the accompanying drawings, forming a part of the same.

The object of this invention is to increase the capacity of ordinary hot-air furnaces, and especially to extend its heating-power to remote parts of a building where the hot air cannot be profitably. conducted.

The invention consists in an attachment for heating water in the furnace fire-pot to supply one or more water-radiators, and which attachment is made to the furnace without affecting or impairing its capacity for heating the air which supplies the hot-air dues connected therewith, and is arranged within the firepot in contact with the fuel'without interference with the feedingdoor.

Heretofore a coil of wrought-iron pipe has been applied to a fire-box to produce a circulation of water or steam in a radiator; but the inlet and outlet to such pipe cannot by any means be made greater than the bore of the pipe itself, nor can the internal capacity of such pipe for conducting a circulationbe made any greater by increasing the number of turns in the coil. The volume of water which can be circulated through such a coil of wroughtiron pipe is therefore limited to its sectional area; and my invention is intended to furnish a water-heating chamber of greater circulating capacity than such a coil by employing a chamber of vertical oblong section, and to expose it most effectually to the heat of the fuel in the fire'pot by making it smaller than the internal diameter of the latter and arranging it within the fire-pot so that it shall be in contact with the fuel upon its lower side and in contact with the heated gases upon both its inner and outer peripheries.

My invention therefore consists, partly, in the shape and arrangement of the annular chamber inside the fire-pot, partly in its arrangement below the level of the door, and

partly in other constructive features, which will be fully understood by reference to the annexed drawings, which show my improvements applied to a Richardson and Boynton hot-air furnace.

Figure 1 exhibits a vertical section of the furnace, taken through the center of the feeding-door, and the relation of a radiator to the circulatingpipcs, being merely indicated by a square of dotted lines. Fig. 2 is a perspective View taken from the rear side of the annular water-chamber; and Fig. 3 is a view of the bottom of the water-cap, showing two of the outlet-pipes inserted therein and a part of the elbow-connections for the same.

This construction, like other hot-air, furnaces, isprovided with a fire-p0t,a, surrounded by a wall or casing, b, from which register fines or pipes b are conducted, the space 1) between the fire-pot and the casing serving for the introduction of the air in contact with the firepot to heat it in the usual manner, the firepot being constructed with a fire-dome, f, which serves as a combustion-chamber, and is made of different forms in various hot-air furnaces.

In the furnace illustrated, smoke-pipes f? are also provided to convey the products of combustion to a hollow ring, f which serves as a hot-air radiator, and from which the smoke and gases pass to a smoke-flue, f. A feedchannel, g, extends from the dome f to the door at the top of the fire-pot a, and within the fire-pot, just below the level of such door or feeding-passage, Ilocate my annular chamber e, connecting the inlet-pipe'i to the bottom of the same, and leading four outlet-pipes, k, from the top of the same upward inside the drum f, where they are connected with a watercap, k.

The waterchamber consists in a hollow castiron ring of much greater depth than width, as shown at the left side of its section in Fig. 1, and is made of smaller diameter externally than the inside of the fire-pot at the point where it is placed, so that an air-space, Z, is left between the outside of the chamber and the fire-pot for the upward passage of the gases generated in the combustion of the fuel.

The water-chamber is provided with a lug, 6*, below its rear edge for the insertion of the inlet-pipe 2',- but the width of the hollow ring which constitutes the water-chamber is too small for the insertion in itsupper edge of a large outlet-pipe therein, and to avoid an eX- ccssive thickening of the ring at any point to introduce an outlet-pipe equal to the area of the inlet I use the series of upright pipes 7c, whose collective capacity is equal to that of the inletpipe. The ring is therefore thickened, as at 6 where such outlet-pipes are inserted, the space between two of such pipes being arranged adjacent to the feeding-passage 9, so that the pipes will not obstruct the entrance of the fuel to the fire-pot. The watercap 70 is preferably made of conical form, tapering upward,the series of outlet-pipes being screwed separately in its lower side, as at k in Fig. 3, while a radiator-pipe, m, of capacity equal to the entire series, is connected with the top of the cone and connected with the radiator R, (merely indicated herein by a square of dotted lines.)

The water-cap is formed of conical shape,

partly to correspond with the conical form of the dome f and partly to receive the water from the series of pipes 70 upon its lower side and direct it to the single pipe m upon its upper side, and it is located within the top of the fire-dome f, and not only serves to connect the outlet-pipes k with the radiatorpipe m, but it receives a great degree of heat from .the fuel in the fire-pot, and thereby protects the top of the dome from overheating, to which the water'cap itselfis not liable, on account of the watercirculation therein.

The annular water-chamber, being made very narrow in its section, furnishes no perceptible obstruction to the introduction of fuel to the fire-pot or of its combustion therein, and the pipes are readily connected with the central water-cap by elbows n, as shown in the drawings. These elbows, as well as all the pipeconnections between the water-chamber and the water-cap, are exposed to intense heat, and operate as a most efficient agent to heat the water as well as the chamber 6. The pipe 2' is also connected with the radiator R, and serves to return the water to the water-chamber 6 when cooled.

1 am well aware that it is not new to form an annular water-chamber in the side of a furnace, as is shown in United States Patent No. 127,476, dated June 4:, 1872, and in Patent No. 348,885, dated September 7, 1886, and I therefore disclaim the said patents and any construction in which the annular water-chamber is notlocated wholly within the fire-pot and exposed to the products of combustion on both itsinner and outer peripheries. My invention is limited to the specific construction herein described and claimed.

What I claim is-- 1. In a hot-air furnace,the combination, with the fire-pot a, surrounded by the air-space b and casing b, of the annular water-chamber e,

constructed smaller externally than the interior of the fire-pot and of oblong vertical section, and located in the fire-pot in contact with the fuel and with the heated gases circulated upon both its inner and outer peripheries, and having a series of outlet-pipesk, extended from its top into the dome of the fire-pot and thence to a hot-water radiator, and an inlet-pipe, i, of capacity or area greater than any of the pipes 75, the whole being arranged and operated to heat the air in the spaces b", to supply hotair registers, and to circulate hot water th rough the chamber 0 and one or more hot-water radiators, substantially as herein shown and described. v

2. In a hot-air furnace, the combination, with the firepot a and the surrounding airspaces b and easing b, of the fire-dome or combustion-chamber f above the fire-pot, a door opening into the same, the annular waterchamber 6, smaller externally than the interior of the fire-pot and of oblong vertical section, located within the fire-pot below the bottom of the door in contact with the fuel and with the heated gases circulated upon its inner and outer peripheries, the outlet-pipes k, projected from its top at each side of the door, and the conical cap is, connected on its lower side with the series of pipes k, and operating to direct the fluid to a single outlet in the top of the cap, and the cap being located within the top of the dome f, and the whole being arranged and operated substantially as herein set forth.

3. The combination, with a fire-pot, of a surrounding air-chamber for feeding hot-air flues, a cast-iron annular waterchamber, of oblong vertical section and diameter less than the interior of the firepot, fitted within the latter'below the level of its feeding door and provided with suitable connections to circulate hot water through a radiator, substantially as herein set forth.

In testimony whcreofl have hereunto set my hand in the presence of two subscribing witnesses.

WILLIAM M. M ACKAY.

Witnesses:

WM, SMITH MoRIsoN, HENRY J. MILLER. 

